Weather on August 9
Santa Rosa, CA
55 Years of Data
Avg High
83°F
Avg Low
53°F
Warmest
2002
78°F avg
Coldest
1986
59°F avg
About This Date
August 9th in Santa Rosa, CA typically brings warm summer weather, with average highs around 83°F and lows near 53°F — a 30°F daily swing. Over 55 years of records, the warmest August 9th was in 2002 (78°F average), while the coldest was 1986 (59°F) — a 19°F range across recorded history. This date has historically been dry, with little recorded precipitation. The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.3°F warmer on this date compared to 20-30 years ago.
Planning for August 9th in Santa Rosa, CA? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 55° | 72° | — | — |
| 2024 | 84° | 52° | 68° | — | — |
| 2023 | 78° | 56° | 67° | — | — |
| 2022 | 83° | 54° | 68° | — | — |
| 2021 | 87° | 48° | 68° | — | — |
| 2020 | 90° | 54° | 72° | — | — |
| 2019 | 82° | 55° | 69° | — | — |
| 2018 | 95° | 51° | 73° | — | — |
| 2017 | 77° | 55° | 66° | — | — |
| 2016 | 85° | 53° | 69° | — | — |
| 2015 | 85° | 55° | 70° | — | — |
| 2014 | 76° | 53° | 64° | — | — |
| 2013 | 70° | 51° | 60° | — | — |
| 2012 | 92° | 50° | 71° | — | — |
| 2011 | 82° | 53° | 68° | — | — |
| 2010 | 73° | 52° | 62° | — | — |
| 2009 | 93° | 54° | 73° | — | — |
| 2008 | 79° | 51° | 65° | — | — |
| 2007 | 75° | 54° | 64° | — | — |
| 2006 | 96° | 55° | 76° | — | — |
| 2005 | 76° | 50° | 63° | — | — |
| 2004 | 76° | 55° | 65° | — | — |
| 2003 | 81° | 52° | 66° | — | — |
| 2002warmest | 99° | 58° | 78° | — | — |
| 2001 | 72° | 53° | 62° | — | — |
| 2000 | 73° | 56° | 64° | — | — |
| 1999 | 75° | 55° | 65° | — | — |
| 1998 | 85° | 50° | 67° | — | — |
| 1997 | 72° | 59° | 65° | — | — |
| 1996 | 99° | 50° | 74° | — | — |
| 1995 | 87° | 58° | 72° | — | — |
| 1994 | 84° | 52° | 68° | — | — |
| 1993 | 78° | 50° | 64° | — | — |
| 1992 | 91° | 57° | 74° | — | — |
| 1991 | 86° | 54° | 70° | — | — |
| 1990 | 86° | 59° | 73° | — | — |
| 1989 | 80° | 52° | 66° | — | — |
| 1988 | 76° | 52° | 64° | — | — |
| 1987 | 70° | 53° | 61° | — | — |
| 1986coldest | 69° | 49° | 59° | — | — |
| 1985 | 84° | 53° | 69° | — | — |
| 1984 | 91° | 48° | 70° | — | — |
| 1983 | 86° | 53° | 70° | — | — |
| 1982 | 79° | 53° | 66° | — | — |
| 1981 | 95° | 50° | 73° | — | — |
| 1980 | 82° | 51° | 67° | — | — |
| 1979 | 86° | 52° | 69° | — | — |
| 1978 | 84° | 55° | 70° | — | — |
| 1977 | 81° | 54° | 67° | — | — |
| 1976 | 85° | 50° | 67° | — | — |
| 1975 | 93° | 50° | 72° | — | — |
| 1974 | 79° | 53° | 66° | — | — |
| 1973 | 77° | 54° | 65° | — | — |
| 1972 | 80° | 55° | 68° | — | — |
| 1971 | 99° | 54° | 76° | — | — |
55 years of data from SANTA ROSA